30YearWeather
Chiang Mai in September
Chiang Mai weather in September - Thailand
🌧️Wet Season

Chiang Mai Weather in September

Plan your September trip to Chiang Mai, Thailand. Based on 30 years of NASA data, expect temperatures of 29°C (high) to 23°C (low), with 66% rain probability and 8 hours of daily sunshine. Pack rain gear for around 30 rainy days.

Avg High
29°C

Hottest around day 1

Avg Low
23°C

Coolest around day 28

Rainy Days
30days

66% avg rain chance

Sunshine
8hrs/day

Autumn season

Chiang Mai September Weather Calendar

Click any day to see detailed weather information

Day 1
rain
Rainy
30°C59%
Day 2
rain
Rainy
30°C59%
Day 3
rain
Rainy
30°C57%
Day 4
rain
Rainy
30°C55%
Day 5
rain
Rainy
30°C57%
Day 6
thunderstorm
Stormy
30°C64%
Day 7
thunderstorm
Stormy
29°C70%
Day 8
thunderstorm
Stormy
29°C70%
Day 9
thunderstorm
Stormy
29°C74%
Day 10
thunderstorm
Stormy
29°C78%
Day 11
thunderstorm
Stormy
29°C77%
Day 12
thunderstorm
Stormy
29°C74%
Day 13
thunderstorm
Stormy
29°C74%
Day 14
thunderstorm
Stormy
30°C73%
Day 15
thunderstorm
Stormy
30°C72%
Day 16
thunderstorm
Stormy
30°C71%
Day 17
thunderstorm
Stormy
30°C69%
Day 18
thunderstorm
Stormy
30°C67%
Day 19
thunderstorm
Stormy
29°C67%
Day 20
thunderstorm
Stormy
29°C65%
Day 21
thunderstorm
Stormy
29°C65%
Day 22
thunderstorm
Stormy
29°C64%
Day 23
thunderstorm
Stormy
29°C65%
Day 24
thunderstorm
Stormy
29°C67%
Day 25
thunderstorm
Stormy
29°C64%
Day 26
thunderstorm
Stormy
29°C62%
Day 27
thunderstorm
Stormy
30°C61%
Day 28
thunderstorm
Stormy
30°C62%
Day 29
thunderstorm
Stormy
30°C62%
Day 30
thunderstorm
Stormy
30°C65%

Essential Travel Info for Chiang Mai

🗓️ Best Time to Visit📖 Travel Guide🍴 Food Guide

Currency

THB

฿ Thai baht

Language

Thai

Driving

Left side

Connect

Many guesthouses, hotels, cafes, bars, r...

Safety

Moderate Safety

GPI: 2.098

Travel Intelligence

Exclusive flight analytics & health data for Chiang Mai

Smart Flight Estimator

Airport-to-Airport Logistics

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Flight Connectivity Analysis

Airport traffic data & seasonal patterns

Moderate
41/ 100
Traffic Index

Balanced traffic

Peak Daily Arrivals

0

slots per day

Peak

Jan

Low

Jun

Monthly Traffic Distribution

106
Jan
103
Feb
97
Mar
90
Apr
89
May
25
Jun
81
Jul
82
Aug
70
Sep
84
Oct
69
Nov
97
Dec
Traffic Level
Low Season

Key Connections

Bangkok Don Mueang (DMK)
Bangkok Suvarnabhumi (BKK)
Phuket (HKT)
Seoul Incheon (ICN)
Krabi (KBV)

Health & Safety Advisory

CDC travel health recommendations

11 Recommendations
COVID-19

All eligible travelers should be up to date with their COVID-19 vaccines. Please seeYour COVID-19 Vaccinationfor more information.

Chikungunya

There iselevated chikungunya riskin Thailand.Chikungunya vaccinationmay be considered for people traveling or moving to this location if they are planning to stay for an extended period of time (for example, 6 months or more).

Cholera

There is no longer active cholera transmission and vaccine is not recommended.

Hepatitis A

Recommended for unvaccinated travelers one year old or older going to Thailand.Infants 6 to 11 months old should also be vaccinated against Hepatitis A. The dose does not count toward the routine 2-dose series.Travelers allergic to a vaccine component should receive a single dose of immune globulin, which provides effective protection for up to 2 months depending on dosage given.Unvaccinated travelers who are over 40 years old, are immunocompromised, or have chronic medical conditions planning to depart to a risk area in less than 2 weeks should get the initial dose of vaccine and at the same appointment receive immune globulin.

Hepatitis B

Recommended for unvaccinated travelers younger than 60 years old traveling to Thailand. Unvaccinated travelers 60 years and older may get vaccinated before traveling to Thailand.

Japanese Encephalitis

Recommended for travelers whoAre moving to an area with Japanese encephalitis to liveSpend long periods of time, such as a month or more, in areas with Japanese encephalitisFrequently travel to areas with Japanese encephalitisConsider vaccination for travelersSpending less than a month in areas with Japanese encephalitis but will be doing activities that increase risk of infection, such as visiting rural areas, hiking or camping, or staying in places without air conditioning, screens, or bed netsGoing to areas with Japanese encephalitis who are uncertain of their activities or how long they will be thereNot recommended for travelers planning short-term travel to urban areas or travel to areas with no clear Japanese encephalitis season.

+5 more

Source: CDC Travelers' Health

View Complete Health Guide

Is September a Good Time to Visit Chiang Mai?

👌Good option with minor considerations
Short Answer

Chiang Mai during September means embracing the rain (66%, 7mm typical). Some activities may be affected, but the lush landscapes and fewer tourists can be rewarding.

Decision Factors

Oppressive heat and humidity

29.4°C with 87% humidity - challenging conditions

High rainfall period

66% rain probability, 6.9mm average

Vaccinations required

Yellow Fever

Feels significantly hotter than 29.4°C

Heat index: 38°C due to 87% humidity

Health precautions needed

Be aware of: Leptospirosis, Melioidosis, Dengue

Plenty of sunshine

8.5h of sunshine daily

Good For

  • 💼
    Business travelers

    Climate-controlled meetings unaffected by weather

Who Should Avoid

  • 👴
    Elderly travelers

    Heat index of 38°C poses health risks

  • 🥾
    Outdoor enthusiasts

    66% rain probability disrupts outdoor activities

  • 📸
    Photographers

    84% cloud cover limits natural light opportunities

  • 💑
    Honeymoon couples

    Wedding score only 60/100 - better months available

Related Guides

Best Time to VisitWhen to AvoidChiang Mai Overview
900 observations30-year historical data
Confidence: 95%

"According to 30YearWeather's analysis of 30 years of NASA POWER satellite data,Chiang Mai in September averages 29°C with 66% precipitation probability."

📊 Source: 30YearWeather.com🛰️ Data: NASA POWER (1991-2021)View Methodology →

Frequently Asked Questions: Chiang Mai in September

What are the temperatures in Chiang Mai in September?

Daytime highs average 29°C, nights drop to 23°C. Temperatures remain fairly consistent.

How many rainy days in Chiang Mai in September?

Expect around 30 days with measurable rainfall. Definitely pack rain gear.

What to wear in Chiang Mai in September?

Light, breathable fabrics. Don't forget sunglasses and a hat.

Is September peak season in Chiang Mai?

This is off-peak season. Expect lower prices and fewer crowds.